Javascript is interpreted by web browsers. To write Android apps you need Java. The only thing the two have in common is the first 4 letters. Javascript is a completely interpreted language, Java is a semi-compiled language. Kind of like English and pictographs.

If you want a simpler language, learn Objective C and write iPhone apps.

If you want a simple language to write cellphone apps in, there's no such thing.

(Javascript isn't much simpler than Java, it's just that most of the Javascript you see is trivial code. "Hello, World" in Java is also pretty trivial. But go through the entire source code of a web page with a jqGrid on it that does complex queries, and you'll see that Javascript can be much more complex than many Android apps.)

No. Android uses Java. iOS uses Objective C. (If you're going to learn Objective C, you might as well learn Java. Java is a C-ish language, and no more difficult to learn than Objective C. No language is difficult to learn, it's programming that's the difficult part. Languages are easy.)